Figure 6

“Second order peak”intensity under an in-plane magnetic field. (a) The normalized sum, (b) normalized dichroism, and (c) asymmetry ratio of the left and right circular polarization XRMS “second order peaks” (“SOPs”) for sample S1 (green, circles), S2 (black, squares) respectively. Open (filled) represent the “SOP” at \(-\, 2\tau\) (\(+\,2\tau\)). Data points are joined as a eyeguide. (d)–(i) Transversal cut along \(\hat{x}\) of micromagnetic simulations showing the \(\hat{x}\) and \(\hat{y}\) (background colour) and \(\hat{z}\) (arrows) components of the magnetization for S1 [(d, e)], S2 [(f, g)] and S3 [(h, i)] respectively. We plot only the magnetization angle in the DW of each magnetic layer without considering the spacer and heavy metal layers. The colourbar in (g) has been modified to increase the contrast of \(M_y\) values for a better visualization. The magnetic states are shown at zero field after being saturated at 1 T in \(\hat{y}\) direction. Domain walls are spontaneously generated at random x position and are aligned for convenience. Points at 0 and 0.19 T are also shown in Flewett et al.²³.